move to package
rename to cplay-ng

This leaves most occurrences of "cplay" untouched. For example, we still
use cplayrc. Only the console script and distribution are renamed.
replace cnq by a complete FIFO tool
fix FIFO volume
Merge branch 'feature-cnq'
improve README format
ALSA mixer: use master by default
also include .po files in distribution

this is needed for some distributions methods. I do not yet fully
understand how this works.
update installation instructions
bump version to 2.0.0